From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E910C433F5 for ; Wed, 4 May 2022 08:36:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236939AbiEDIj4 (ORCPT ); Wed, 4 May 2022 04:39:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234997AbiEDIj4 (ORCPT ); Wed, 4 May 2022 04:39:56 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 121E91C934 for ; Wed, 4 May 2022 01:36:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1651653380; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=l2/54J4UaHQ0UnqSHXfaM9ipM+s6a++G2efwcmiOmwE=; b=MjXvv4LAgdNhmP1v9WMC/MpY2mGX8zPXpQssc+qDMt68+sZpZuLZdO77TQJdkdkecLuXbk /1abwiuyBDZkBcrdIRQNHAGzkckk3XuEw1kyun16vO4QzgRLokNnYSHGcQ8vi92qdNBo8c 1c0kSfHDEkHDhJv/G6H7QYYTn3yU+J4= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-86-GW79d4ZYOt6ToV71k4_f9g-1; Wed, 04 May 2022 04:36:17 -0400 X-MC-Unique: GW79d4ZYOt6ToV71k4_f9g-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CD87329A9CCC; Wed, 4 May 2022 08:36:16 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.39.192.125]) by smtp.corp.redhat.com (Postfix) with ESMTP id 47CB841372B; Wed, 4 May 2022 08:36:15 +0000 (UTC) From: Jose Ignacio Tornos Martinez To: gregkh@linuxfoundation.org, stern@rowland.harvard.edu, linux-usb@vger.kernel.org Cc: marcel@holtmann.org, Jose Ignacio Tornos Martinez Subject: [PATCH v4] USB: core: skip unconfiguration if device doesn't support it Date: Wed, 4 May 2022 10:36:12 +0200 Message-Id: <20220504083612.143463-1-jtornosm@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Bluetooth Dongles with CSR chip (i.e. USB Bluetooth V4.0 Dongle by Trust) hang when they are unbound from 'unbind' sysfs entry and can not be bound again. The reason is CSR chip hangs when usb configuration command with index 0 (used to unconfigure) is sent during disconnection. To avoid this unwanted result, it is necessary not to send this command for CSR chip, so a new quirk has been created. Athough device is not unconfigured, it is better to avoid device hanging to be able to operate. Even bluetooth can be previously turned off. On the other hand, this is not important if usb device is going to be bound again (normal behavior), i.e. with usbip. Signed-off-by: Jose Ignacio Tornos Martinez --- V3 -> V4: - Reorder quirk entries to be in numerical order according to the vendor ID and product ID. - Add patch version information. V2 -> V3: - Change subject (Bluetooth: btusb: CSR chip hangs when unbound -> USB: core: skip unconfiguration if device doesn't support it). - Improve quirk checking. - Allow to test quirk interactively. V1 -> V2: - Use quirk feature for the exception. Documentation/admin-guide/kernel-parameters.txt | 2 ++ drivers/usb/core/message.c | 12 +++++++++--- drivers/usb/core/quirks.c | 6 ++++++ include/linux/usb/quirks.h | 3 +++ 4 files changed, 20 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3f1cc5e317ed..71651b888d14 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6183,6 +6183,8 @@ pause after every control message); o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra delay after resetting its port); + p = USB_QUIRK_SKIP_UNCONFIGURE (device doesn't + support unconfigure); Example: quirks=0781:5580:bk,0a5c:5834:gij usbhid.mousepoll= diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 4d59d927ae3e..9c6cd0c75f4f 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -2108,9 +2108,15 @@ int usb_set_configuration(struct usb_device *dev, int configuration) } kfree(new_interfaces); - ret = usb_control_msg_send(dev, 0, USB_REQ_SET_CONFIGURATION, 0, - configuration, 0, NULL, 0, - USB_CTRL_SET_TIMEOUT, GFP_NOIO); + if (configuration == 0 && !cp + && (dev->quirks & USB_QUIRK_SKIP_UNCONFIGURE)) { + dev_warn(&dev->dev, "device is not unconfigured!\n"); + ret = 0; + } else + ret = usb_control_msg_send(dev, 0, USB_REQ_SET_CONFIGURATION, 0, + configuration, 0, NULL, 0, + USB_CTRL_SET_TIMEOUT, GFP_NOIO); + if (ret && cp) { /* * All the old state is gone, so what else can we do? diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index d3c14b5ed4a1..7c86c8d61570 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -138,6 +138,9 @@ static int quirks_param_set(const char *value, const struct kernel_param *kp) case 'o': flags |= USB_QUIRK_HUB_SLOW_RESET; break; + case 'p': + flags |= USB_QUIRK_SKIP_UNCONFIGURE; + break; /* Ignore unrecognized flag characters */ } } @@ -394,6 +397,9 @@ static const struct usb_device_id usb_quirk_list[] = { /* ELMO L-12F document camera */ { USB_DEVICE(0x09a1, 0x0028), .driver_info = USB_QUIRK_DELAY_CTRL_MSG }, + /* CSR Bluetooth */ + { USB_DEVICE(0x0a12, 0x0001), .driver_info = USB_QUIRK_SKIP_UNCONFIGURE }, + /* Broadcom BCM92035DGROM BT dongle */ { USB_DEVICE(0x0a5c, 0x2021), .driver_info = USB_QUIRK_RESET_RESUME }, diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index eeb7c2157c72..79cb0616f394 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -72,4 +72,7 @@ /* device has endpoints that should be ignored */ #define USB_QUIRK_ENDPOINT_IGNORE BIT(15) +/* device doesn't support unconfigure. */ +#define USB_QUIRK_SKIP_UNCONFIGURE BIT(16) + #endif /* __LINUX_USB_QUIRKS_H */ -- 2.35.1